Improvement in chronograph watches



I C. MEYLAN.

Chronograph Watches.

NO.l5],8Q9. I PatentedJune9,1874,

UNITED STATES PATENT QEEICE.

CHARLES MEYLAN, OF NEV YORK, N. Y., ASSlGNOR TO HIWSELF AND L. AND A. MATHEY, OF SAME PLAGE.

IMPROVEMENT IN CHRONOGRAPH WATCHES.

Specification forming part of Letters Patent No. 151,899, dated June 9, 18711; application tiled April 28, 1873.

To all ywhom it may concern Be it known that I, CHARLES MEYLAN, of the city and State ot' New York, have invented an Improvement 'iii\Vatclies,ot which the following is a specification:

This invention relates to that class of movements known in the trade as chronographs, in which an independent secondhand is employed to indicate periods of observation, by starting the independent hand as the observation commences, and stopping the samelat the end of the observation. Heretotore this has been done by a puslrpin acting on mechanism that iirst starts, then stops the hand, and a third push returns the hand to the nor- `mal position at XII on the dial.

The present invention is made for the purpose of simplifying the mechanism and operating a minute-haml simultaneously with a second-hand.

In the drawing, Figure l represents the chronograph mechanism with a portion removed. Fig. 2 is a section at the center arbor. Fi is the reverse side of the disk i'or the second-wheel, removed in Fig. l; and Fig. 4 is the reverse view ot' the minute-hand wheel or disk.

The watch-plate a is oi any usual character, and upon it the gearing or train, mainsp'ring, balance, or other parts et' the watch are connected. rl-he arbor I ot the ordinary minutehand c is revolved in the ordinary manner7 and so also is the arbor d that carries a second-hand. The push-pin j" actuates the lever g, pawl 7L, and cam ratchetwheel and by means thereof' the mechanism of thc chronograldi is brought into action bythe iirst push, stopped by the second push7 and returned. to the starting point by a third push. Upon the arbor b is a tubular arbor, l, extending' through the watch-tace, and receiving the independent minute-hand 7c, and around this arbor lis another tubular arbor, i', receiving the independent seeond-haml s. These arbors pass through the bridge t, that is partially removed in Fig. l. The hour-hand is upon a tubular arbor that surrounds the tubular bearing of the bridge t, and it is driven by any usual mechanism. The disk o is upon the inner end of the tubular arbor l, and so also is the heart-cani o; and the disk u and its heart-cani e are upon the inner end ot' the tubular bearing r; and these heart-cams o and n are hence contiguous, and between the respective wheels o and a, and in a position to be acted upon simultaneously by vthe pointed lever' rl and spring tte return the respective minute and second hands k and s to a normal position at XH. This result is atta-ined upon the third movement of thev push-pin j" that acts upon the cam ratchetwheel. i, and through that upon the lever r1. The wheel o is provided with a friction-spring, hl, that bears against the side ot' the arbor b oi' the minutehand c; or the spring may bear against thc top end of the pinion. In either case, when no other force is operative, the wheel o, arbor l, and hand L' turn with the usual minute-hand; but, upon the second push ot' the pin j', the wheels 0 and a are stopped, with their respective hands L and s,by the lever l1?, that has an inclined surface, being forced by one of the cams of fi beneath the edge of the wheel o, and thereby pressing the heart-cams o and T against each other, and binding the wheel u against the under surface ot' the bridge t, thus stopping the move ment ot' the elironograph-hands without applying any unusual friction to the ordinary watchinovement.

It now only remains to describe the manner ot' actuating the second-hand from the arbor d ot' the ordimiry second-hand.

rlhe wheel l? on the second-hand arbor d, and the wheel fui, remain in gear; but the disk y is moved from contact with the wheel 'uy by the lever u2 and cam ratchet-wheel i at the second. push ot' the pin j', and so renziains after the third push. oi.- said pin, but the iirst push liberates this 1eve1xa2,and allows the spring a to press the disk y to the whe 3l a, and revolve the saine. The edges of these wheels, y and a, may be roughened or made with iine teeth.

l claim as my invention-- l. The wheels u and o on the arbors of the independent second and minute hands, :in hands hy pressing them toward the bridge t, Combination with the two Contiguous hezutas set forth.

annie, v and o', and the one level` T1, that Signed by me this 23d day of Ap1il,A.D. passes in between said wheels u and o and 187:3. operates upon said heurt-cams, substantially .1S Set forth (JHARL ES MEYLAN.

2. The lever h2, With un inclined. end acting rituessesz beneath and in combination with the Wheels GEO.T. lIYCJKYEY7 o and y11,[0 stop them and their respective CHAS. H. SMITH. 

